21365031052530 has 128 divisors (see below), whose sum is σ = 63832623816960. Its totient is φ = 5039417617920.

The previous prime is 21365031052471. The next prime is 21365031052543. The reversal of 21365031052530 is 3525013056312.

21365031052530 is a `hidden beast` number, since 2 + 1 + 3 + 65 + 0 + 3 + 10 + 52 + 530 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 97101099 + ... + 97320878.

It is an arithmetic number, because the mean of its divisors is an integer number (498692373570).

Almost surely, 2^{21365031052530} is an apocalyptic number.

21365031052530 is an abundant number, since it is smaller than the sum of its proper divisors (42467592764430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21365031052530 is a wasteful number, since it uses less digits than its factorization.

21365031052530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194422041 (or 194422035 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The spelling of 21365031052530 in words is "twenty-one trillion, three hundred sixty-five billion, thirty-one million, fifty-two thousand, five hundred thirty".